Penguins are powerful swimmers. Scientists have concluded that penguins evolved adaptations for powerful swimming early in their evolutionary history. Which of the following pieces of evidence did scientists most likely use to make this conclusion?a. DNA sequences of different penguin speciesb. maps of the global distribution of penguin speciesc. fossils showing the shape of ancient penguins’ wings and feathersd. x-rays of the bone structure in modern penguins’ wings